Submit "KEEPALIVE" message also for lonpoll socket
Submit "KEEPALIVE" message also for lonpoll socket

Try to avoid very long timeout for submitted HTTP requests
Appears with FastCGI when Apache server has default timeout 300 s
root-project/jsroot,linev/jsroot,bellenot/jsroot,bellenot/jsroot,bellenot/jsroot,root-project/jsroot,linev/jsroot